What else do you like about having X number of monitors in front of you?
I use one - my laptop screen
...or occasionally 2 (projector/TV etc for movies, presentations, etc)
I value mobility more than multiple screens ... especially since I can just swap either between virtual desktops (yes - that includes remote access and VDI tools like VMWare Horizon and terminal windows, but also local virtual screens) or just multiple windows/tabs in a given application